Study On The Growth Modeling And Technical System Of Ecology-based Harvesting And Regeneration For Larch And Spruce-Fir Stands

Forest cutting is a major method of forest utilization, and also one of the measures for forest structure regulation and acceleration of its growth and healthy development. In China, timber utilization has long been taken as the important objective of forest cutting, which renders a very disadvantageous impact on forest itself and the environment. With the advancing of the concept of RIL (Reduced Impact Logging) and Ecology-based Harvesting, people begin to investigate how to let forest both have high economic benefit, and not reduce ecological benefit, biodiversity and ecological/environmental quality. This is just the important problem past management system has seldom studied and not yet settled.Based on a systematic summing-up of stand growth modeling and on an analysis of present research situation of ecological cutting/regeneration, the paper carried through analysis and modeling of growth dynamic of studied objects, and investigated the impact of logging activity on the objects and environment, thus proposing a technical system for logging regeneration in larch and spruce-fir forest environment on Changbai Mountains, including both common technical principles and individual technical indexes. The major conclusions obtained are as the following aspects:1. The study and analysis on experimentation of cutting (include thinning and selected cutting) of larch and spruce-fir stands showed that the transact area and stock volume of cut stands demonstrated the same growth process as the un-cut stands, that is, the stronger the cut intensity, the greater the annual growth rate after cut. The annual growth rate of cut stands is weaker than that of un-cut stands in the early stage after cut, however, it will approach gradually that of un-cut stands with increase of forest age and with acceleration of competition between forest.2. A comparison analysis of growth change rule modeled on single larch tree biomass by using Logistic function and Richards function demonstrated that the result of Logistic function was better than that of Richards function. The overall relative error for...